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The Subaru WRX is known for its performance and handling, making it a favorite among car enthusiasts. One common modification that many WRX owners consider is the installation of polyurethane bushings. This article explores the real-world results of such an installation, specifically focusing on the reported 30 horsepower increase.
Understanding Polyurethane Bushings
Polyurethane bushings are a popular upgrade over the stock rubber bushings found in many vehicles, including the Subaru WRX. These bushings provide several advantages:
- Improved handling and responsiveness
- Increased durability and longevity
- Reduced deflection during acceleration and cornering
- Enhanced overall performance
The Installation Process
Installing polyurethane bushings in a Subaru WRX can be a straightforward process, but it requires some mechanical knowledge and the right tools. Here’s a general overview of the steps involved:
- Gather necessary tools and materials, including a jack, jack stands, wrenches, and the polyurethane bushings.
- Lift the vehicle and secure it on jack stands.
- Remove the old rubber bushings from the suspension components.
- Clean the mounting surfaces to ensure a proper fit for the new bushings.
- Install the polyurethane bushings, ensuring they are properly seated.
- Reassemble the suspension components and lower the vehicle.
Testing and Results
After the installation of polyurethane bushings, many WRX owners report noticeable improvements in their vehicle’s performance. Testing was conducted to measure the horsepower increase resulting from this modification. Here’s how the testing was performed:
- Baseline dyno runs were conducted before the installation of the bushings.
- After the installation, additional dyno runs were performed under similar conditions.
- Results were compared to assess the horsepower increase.
Real-World Results: 30 HP Increase
The results of the testing revealed an impressive increase of 30 horsepower after the installation of polyurethane bushings. This increase can be attributed to several factors:
- Reduced flex and movement in the suspension components, allowing for more power to be transmitted to the wheels.
- Better alignment of suspension geometry during acceleration, leading to improved traction.
- Overall enhancement in vehicle dynamics, resulting in a more responsive driving experience.
Additional Benefits of Polyurethane Bushings
Beyond the horsepower increase, polyurethane bushings offer several additional benefits that enhance the driving experience:
- Improved steering feedback and precision
- Better cornering stability and control
- Reduced noise and vibration compared to stock bushings
- Longer lifespan, reducing the need for frequent replacements
Considerations Before Installation
While the benefits of polyurethane bushings are clear, there are some considerations to keep in mind before installation:
- Polyurethane bushings can transmit more road noise into the cabin compared to rubber bushings.
- Some drivers may prefer the softer feel of stock bushings for daily driving.
- Proper installation is crucial to avoid premature wear or failure of the bushings.
Conclusion
The installation of polyurethane bushings on a Subaru WRX can lead to a significant performance boost, as evidenced by the reported 30 horsepower increase. This modification not only enhances power delivery but also improves handling and overall driving dynamics. For WRX owners looking to elevate their vehicle’s performance, polyurethane bushings are a worthy consideration.